import numpy as np
# vector = np.array([1, 2, 3])
# print vector.shape
# print vector.size
# print vector.ndim
# print type(vector)

# matrix = np.array([[1,2], [3,4]])
# print matrix.shape
# one = np.arange(12)
# print one.reshape((3,4))

zeros = np.zeros((3, 4))
ones = np.ones((5,6))
ident = np.eye(4)
print zeros
print ones
print ident